Added ssl_verify parameter (issue #21)

commit 1c8a8f4bff2273b308577f2c9ea298946fd3d42a
Author: Alexander Else <aelse@else.id.au>
Date:   Wed Nov 6 23:24:23 2013 +1100

    added ssl_verify related tests

commit a91f5dafcaeef1e02803080e91c642500c82a184
Author: Alexander Else <aelse@else.id.au>
Date:   Wed Nov 6 23:24:03 2013 +1100

    CrowdServer verify parameter is now ssl_verify

commit 397688821ca3de5b46b1c5709450e7c029af6a92
Author: Philippe Muller <philippe.muller@gmail.com>
Date:   Mon Nov 4 01:55:50 2013 +0100

    Add a verify parameter for certificate validation

    Default is True.
    Allows disabling certificate validation ; useful en dev environment.